Date: Mon, 8 May 2017 11:23:01 -0700 From: "Ngie Cooper (yaneurabeya)" <yaneurabeya@gmail.com> To: "O. Hartmann" <ohartmann@walstatt.org> Cc: FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: filemon: weird full-time build although filemon enabled Message-ID: <557CD2F0-4E32-41EE-A0A9-DF5D8C189E83@gmail.com> In-Reply-To: <20170506092255.083828f8@thor.intern.walstatt.dynvpn.de> References: <20170506092255.083828f8@thor.intern.walstatt.dynvpn.de>
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[-- Attachment #1 --] > On May 6, 2017, at 00:22, O. Hartmann <ohartmann@walstatt.org> wrote: > > I build CURRENT on two technically similar systems on a almost daily basis. Therefore, it > was a great relief having WITH_META_MODE=yes set in /etc/src-env.conf for incremental > builds. To make my understanding of this clear (just in case I'm wrong): setting > WITH_META_MODE builds only portions that does not need to be build in the make context. > > Well, the reason writing this email is: on one system, I run almost every reboot into a > "full build" and this puzzles me a bit. The long-lasting and time exhausting builds are > within the LLVM/CLANG tree. They consume a lot of time. The box in question does have a > weak CPU, only two physical cores, four threads, 8GB of RAM and builds the /usr/obj > residing on a SSD. The reference machine does have the same motherboard, also a SSD, but > has 16 GB RAM and a 4-core/8 threads XEON CPU - but both are "IvyBridge". The XEON > usually needs 30 - 40 minutes to compile a full world/kernel from a clean /usr/obj, the > "weak" box takes approximately 120 minutes - it is understandable that a shortage of the > build time is appreciated. > > Well, having said this, I need to mention that both systems use almost > identical /etc/src.conf setting - except the order of appearance of the WITH_ tags. In > fact, they are identical except the KERNCONF (naming of the kernel) and PORTS_MODULES=, > the "weak" box incorporates x11/nvidia-driver and emulators/virtualbox-ose-kmod, so these > modules are build every time the system gets rebuild, but the time taken by those is > negligible. > > The problem: to make my point clear: the "weak" box starts compiling almost everytime now > the LLVM/CLANG tree while the XEON box does not. This is spooky. > > I deleted on both systems recently /usr/obj completely from its content and restarted a > buildworld again to hope, that the problem was introduced due to some files > necessary for the BSD make environment to indicate the incremental build. But no success. > Even more spooky is the fact, that after a build on the "weak" box and a build again, the > box bevaves as expected not rebuilding everything again, but in some cases after a > reboot, a rebuild the hits again the build of LLVM/CLANG tree, while the XEON box does > not. > > I think there is something missing an I'd like to ask what is the suggested way to > initially restart a full build to ensure that WITH_META_MODE gets initialised correctly. > > Well, I'm not a developer, so please be patient with my naive report. > > Thanks in advance, Dumb question: which kernel are you using on which machine (GENERIC, GENERIC-NODEBUG, a custom kernel with or without debug hooks, e.g., INVARIANTS, enabled)? Also, how are you building the system (locally using UFS or ZFS, remotely, e.g., over NFS, etc)? Thanks, -Ngie [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iQIcBAEBCgAGBQJZELeGAAoJEPWDqSZpMIYV4wIP/3NKiAjoYSlzyNrPYn5z19oD ATmBevYVq7hzzKUhWEes3ei+2/Umz7cAB+DhNy6PL4ynT2PhVVFCArNjXVWFU+ZB zeoBVO35oeL4C7BHta2gAw6abOCWQHz8YcpOHExM6m2XRJiiABs5TSF57fd53n6d efdXxbe6GYiVwpvVtTX5iCXm3JNJ0EJ2usK3MCud/kR1eVJIjwlW5JhXEkxkVkna 95AFW51q6nvhAx5HKEKlm6L+Lp68YvmN/IJZcT6ZnCo8SkYqHUJOglue0/mwhMt+ cbKjAVCQTHo612yL8btE7uBVGGzYOhEdkslJECbPT0T5yQZO461VvAtduuIZ9ZPJ CZlmToH7kzI5C0ffRreDKmWKPRuZQTENWjYZvYyvbRyc5AF71e8bLSBx7k9ZOgl2 9NU1k8C6dyX+DV26hzsAGW04pQyoXS2fbnBs+GhW9wlnTpEuJjfAk0aym7BWKx1L gkt34hL9jZwucDBgTTcgp9qg+tP6zT23Mc48ZXDU1/Wuhdtl/sXQotvw1bmEUPZE C05GnFcA8LRCFnZt6sxmFO7S+GkubuwhKokt8icNBtcUomYh8COmX2tNiI3R6sY8 oEco9PyFCLDzojoWIhKVzPESW6BtQA18+/cRD8uKH5cOxqTMvL7YkkfrguHDa/nK NJX0htZtMJ6Ev5817Eat =JTxe -----END PGP SIGNATURE-----help
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